If there is any principle of the Constitution that more imperatively calls for attachment than any other it is the principle of free thought, not free thought for those who agree with us but freedom for the thought that we hate.
The ultimate good desired is better reached by free trade in ideas [and] the best test of truth is the power of the thought to get itself accepted in the competition of the market.
But when men have realized that time has upset many fighting faiths, they may come to believe...that the best test of truth is the power of the thought to get itself accepted in the competition of the market... That at any rate is the theory of our constitution.
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